Zeroth Law of Thermodynamics
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The zeroth law of thermodynamics states that if for example
you have a Body (A) and a Body (B), both at the same temperature; and
then you have a Body (C) which is at the same temperature as Body (B);
Therefore the temperature of Body (C) is equal to the temperature of Body
(A).
If the temperature (A) = (B) [where (A) & (B) are bodies] and you have a
body (C) at the same temperature as bodies (A) & (B) therefore:
(A) = (C) = (B)